Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 533
e, but engineersin one of the leading universities of the coun-try have approved it as a practicable, cheaply manu f actu red,simple tool, andhe has been of-fered a consider-able sum for hispatent rights. The tool isreally five augersin one, four littleconical rotary-cutters millingout the corners… … corners at a single operation. Drilling asquare hole through a one-inch piece of marbleby the usual methods takes four hours or moreof careful work by a skilled man. By the newinvention it can be, and has been, done in fiveminutes. And yet the square auger is a simple ma-chine with only a dozen…
Children's literature
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